TECHNICAL TEAM PROJECTS BRIEFING 20TH JANUARY 2016, MILTON KEYNES
MALCOLM HANNA TECHNICAL DIRECTOR
improving the use of energy in buildings
Case Study Findings from a Novel BEMS Installation for Small and
Temporary Commercial Buildings
EMEX: Technology & Innovation 16th November 2016
Dr Thomas Whiffen
THE ASSEMBLE PROJECT
• The project will develop a low cost, easy-to-
install energy management system for small
to medium size non-domestic premises.
• The system utilises the latest innovation in
power line carrier technology to enable low
disruption ‘plug and play’ installation.
• The bespoke user interface offers low energy
comfort, easily controllable on any internet
enabled device.
Internal temperature 22.7°C 22.7°C
External temperature 20.5°C 20.2°C
Saved energy: 12.0 Wh/m2/day
(over six weeks period) (floor area: 933 m2)
Financial savings: £1.12 / day (over six weeks period) (based on 10 p/kWh)
29% AC savings
22% weekend use 6% weekday use
20th Jun – 31th Jul 2016 22th Aug – 2nd Oct 2016
Daily temperatures (t) averaged over the comparison period (taken at 12’o clock) and categorised as follows: COLD: t <9°C, COOL: t >9<14°C, MILD: t >14<19°C, WARM: t >19< 24°C, HOT: t >24°C
1,638
kWh
1,168
kWh
Before After
COSTAIN TRIAL: FINDINGS
COSTAIN TRIAL: HOW?
0
2
4
6
8
10
12
14
16
0007-14 AC (weekend) Before
After
Before After Savings
Total (shown weekend) energy use for 0007-14 AC unit (kWh) 20.56 kWh 0.58 kWh 97%
NEF TRIAL: LAYOUT
Uncontrolled (small offices) 102.5 m2
Controlled (main office) 307.5 m2
Mezzanine
Ground floor
NEF TRIAL: FINDINGS
Before After
173 kWh
335 kWh
sunny: 28% sunny: 39%
light: 64% light: 61%
dark: 8% dark: 0%
Saved energy: 18.2 Wh/m2/day
(over one week period) (floor area: 308 m2)
Financial savings: £0.54 / day (over one week period) (based on 10 p/kWh)
48% lighting savings
Where: Dark equates to >3 hours of lux <25% from 8am till 7pm. Sunny equates to >7 hours of lux >45% from 8am till 7pm Light equates when neither of the above is applicable
NEF TRIAL: HOW?
0
15
30
45
60
75
0
200
400
600
800
1000
1200
1400
1600
1800
Lux,
%
Po
we
r, W
Lts A
Lts B
Lux
18-May Energy for lighting - 23.3 kWh
0
15
30
45
60
75
0
200
400
600
800
1000
1200
1400
1600
1800
00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00 00:00
Lux,
%
Po
we
r, W
Lts A
Lts B
All off
Half off
Half on
All on
Lux
04-Aug Energy for lighting - 6.6 kWh
OVERALL SAVINGS
Total building(1) 302 £30.20 100% £28,177
kWh/m2/yr £/m2/yr(6) % £/yr(7)
Heating energy savings(2)
15.1 £1.51 5.0% £1,409
AC cooling energy savings(3)
10.0 £1.00 3.3% £933
Lighting energy savings(4)
10.4 £1.04 3.4% £971
Behaviour change savings(5)
15.1 £1.51 5.0% £1,409
Total savings 50.6 £5.06 16.8% £4,721
(1)Based on 100 W/m2, 12 hours a day, 252 days a year (Elliotts) (2)Estimated 5-7% heating savings from benchmark figures (BSRIA) (3)Based on Costain J34 summer trial findings and annual temperature profile (4)Based on NEF lighting trial findings and assumed illumination profile (5)Estimated 5-10% from literature (CTV023)
(6)Based on 10p/kWh (7)Based on the Costain J34 office floor area of 933 m2 (46 cabins)
FINDINGS
• Identified importance of robust comms. architecture
• Identified importance of engaging and maintaining
engagement of staff
• Configured set-points as required to optimising
conditions to staff desires
• Demonstrated capability to handle and find meaning
in big data
• Supported development of technology and business
case
• Gained soft acceptance of technology at NEF